Add WasmFrame, backtraces reflect wasm's presence

src/frames.cc

Index: src/frames.cc
diff --git a/src/frames.cc b/src/frames.cc
index 50a2e21a055d7a9d8f11442f6cfa024d555c71dc..73c4e2711ae692231442ef276ea94da7cf93557c 100644
--- a/src/frames.cc
+++ b/src/frames.cc
@@ -134,12 +134,8 @@ StackFrame* StackFrameIteratorBase::SingletonFor(StackFrame::Type type) {
 #undef FRAME_TYPE_CASE
 }
 
-
-// -------------------------------------------------------------------------

[Michael Starzinger, 2016/02/23 09:36:25]

nit: Please bring back the separator comment.

[JF, 2016/02/23 16:00:53]

Done.

-
-
-JavaScriptFrameIterator::JavaScriptFrameIterator(
-    Isolate* isolate, StackFrame::Id id)
+JavaScriptFrameIterator::JavaScriptFrameIterator(Isolate* isolate,
+                                                 StackFrame::Id id)
     : iterator_(isolate) {
   while (!done()) {
     Advance();
@@ -446,7 +442,7 @@ StackFrame::Type StackFrame::ComputeType(const StackFrameIteratorBase* iterator,
       case Code::OPTIMIZED_FUNCTION:
         return OPTIMIZED;
       case Code::WASM_FUNCTION:
-        return STUB;
+        return WASM;
       case Code::BUILTIN:
         if (!marker->IsSmi()) {
           if (StandardFrame::IsArgumentsAdaptorFrame(state->fp)) {
@@ -1222,6 +1218,18 @@ void StackFrame::PrintIndex(StringStream* accumulator,
   accumulator->Add((mode == OVERVIEW) ? "%5d: " : "[%d]: ", index);
 }
 
+void WasmFrame::Print(StringStream* accumulator, PrintMode mode,
+                      int index) const {}

[Michael Starzinger, 2016/02/23 09:36:25]

nit: Can we print something here? Just one single line saying "Wasm frame" or
something like would be fine. It would just be nice to not have it silently fly
under the radar during debugging.

[JF, 2016/02/23 16:00:53]

Done.

+
+Code* WasmFrame::unchecked_code() const {
+  return static_cast<Code*>(isolate()->FindCodeObject(pc()));
+}
+
+void WasmFrame::Iterate(ObjectVisitor* v) const { IterateCompiledFrame(v); }
+
+Address WasmFrame::GetCallerStackPointer() const {
+  return fp() + ExitFrameConstants::kCallerSPDisplacement;
+}
 
 namespace {